I completely understand your point, but why would this be limited to Greek life? Honestly in my experience Greek members are so much more responsible in their drinking/ partying habits versus non-members. As VP of mine I had to take care of a lot of problems my house would have and 90% of the time a person was too drunk/ had to have an ambulance called/ started a fight/ etc. they weren't involved in Greek life. We all take alcohol and safety classes and are educated on proper sexual conduct (i.e. sexual assault and whatnot) and do things that the general student body does NOT do. Out of every female I know, only one who was sexually assaulted was in a fraternity house. The countless others were by random people in the community, student body, or their friends.
I get that fraternities have negative stereotypes and I understand why some may have that, but to think that just because someone is in Greek life means they party anymore or drink anymore than literally any college student is naive. If this were actually true, why are the all-Greek, sorority, and even the fraternities GPA averages significantly higher at my undergrad than the overall GPA of the student body? Apparently having balance to ones life is effective.
I don't know. Ultimately it doesn't matter and I know for a fact my leadership roles in my fraternity won't leave me out of medical school, it's just annoying to hear these things coming from actual admissions officers.